In the case of steam-generating plants (for campus heating), I am aware that some use heat recovery chillers to capture some of the waste heat. Not sure how this would best be tagged. I used “plant:method=combustion;heat_recovery” and “plant:source=gas;waste_heat” since both gas and heat recovery are used to generate the steam. Some info about the particular facility, if it interests you.
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Looks sensible to me.